Tweco 170 HF Weldskill - Manual (Page 41)

WELDSKILL 170 HF INVERTER
5-5 April 23, 2008
5.06 Welding Power Source Problems
Description Possible Cause Remedy
A. The Primary supply voltage
has not been s w itched ON
A. S w itch ON the Primary supp ly
voltage
B. The Welding Po w er So ur ce
s w itch is s w itched OFF
B. S w itch ON t he Weldi n g Power
Source
1 The welding arc cannot be
estab l ished
C. Loose connections internally C. Have an Accredited Cig w eld
Service Provider repair t h e
co n nectio n
2 Ma x imum output w eld i ng
current cannot be achieved
w ith nominal Mains s u pply
voltage
Defective control circuit Have a n Accredited Cigweld
Service Provider inspect then
repair the
welder
3 Welding current reduces
w hen welding
Poor w ork lead connection
to the work piece
E n sure that the w ork lead has
a positive electrical connection
to the
w ork piece
4 TIG elect r ode melts w hen
a r c is struck
TIG torch is connected to
the (+) VE terminal Co n nec t the T I G torch to the
(-) VE termi n al
5 Arc flutters du r ing TIG
welding
Tungsten electrode is too
large fo
r the w elding cu r ren t
Select the correct size of
t u n gste n elect r ode
6 No High Frequency is
produced.
A. Process selection switch is
set to Manual Arc or Lift TIG
Mode.
B. Torch Trigger Switch lead is
disconnected or switch/lead
is faulty.
C. High Frequency Spark Gap
too wide or short circuited.
A. Set process Selection Switch
to HF TIG Mode.
B. Reconnect or repair TIG torch
trigger switch/lead.
C. Have an Accredited Cigweld
Service Provider adjust spark
gap to be 0.5 – 0.6mm.
7 No Gas Flow when the TIG
Torch Trigger Switch is
depressed.
A. Gas Regulator is turned off.
B. Gas Hose is cut.
C. Gas passage contains
impurities.
D. Torch Trigger Switch lead is
disconnected or switch/lead
is faulty.
A. Turn Gas Regulator on.
B. Replace Gas Hose.
C. Disconnect Gas Hose from the
rear of the power source then
raise the gas pressure and
blow out impurities.
D. Reconnect or repair TIG torch
trigger switch/lead